(n) a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite, Syn.atomic number 37, Rb
(n) geological dating based on the proportions of radioactive rubidium into its decay product strontium; radioactive rubidium has a half-life of 47, 000, 000, 000 years
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ NL., fr. L. rubidus red, fr. rubere to be red. So called from two dark red spectroscopic lines by means of which it was discovered in the lepidolite from Rozena, Moravia. See Rubicund. ] (Chem.) A rare metallic element of the alkali metal series, atomic number 37. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.48. [ 1913 Webster ]
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